Quote Originally Posted by Yoda View Post
The behavior may be different for different vehicles. My experience before was almost the same as his. Car had no thermostat, radiator was fine, thermoswitch for the radiator fan was fine.

From a cold start and just idling, the temp does rise, medyo matagal nga lang. At a little above 1/2, the thermoswitch activates the fan until it goes a little below 1/2. Cycle continues.

If the car's running, the temp would never go past 1/4. The faster water circulation and constant airflow through the radiator would keep the temp cool.

When I installed a thermostat, temp would rise quickly to 1/2 and stay there.
I see. So a good question to Userfriendly is if he has a thermostat?